The phrase is not as straightforward as it seems. Ever since the scientific revolution, two compulsions have guided conservative Protestant intellectual life: the impulse to defend the Bible as a reliable scientific authority and the impulse to place the Bible beyond the claims of science entirely.
The first impulse blossomed into the doctrine of biblical inerrancy. Scripture became the irrefutable guide to everything from the meaning of fossils to the interpretation of archaeological findings in the Middle East, a “storehouse of facts,” as the 19th-century theologian Charles Hodge put it.
The second impulse, the one that rejects scientists’ standing to challenge the Bible, evolved by the early 20th century into a school of thought called presuppositionalism. The term is a mouthful, but the idea is simple: We all have presuppositions that frame our understanding of the world. Cornelius Van Til, a theologian who promoted this idea, rejected the premise that all humans have access to objective reality. “We really do not grant that you see any fact in any dimension of life truly,” he wrote in a pamphlet aimed at non-Christians.
If this sounds like a forerunner of modern cultural relativism, in a way it is — with the caveat that one worldview, the one based on faith in an inerrant Bible, does have a claim on universal truth, and everyone else is a myopic relativist.